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| name | cis-aws-foundations-5.13 |
| description | Ensure route table changes are monitored |
| category | cis-monitoring |
| version | 7.0.0 |
| author | cyberstrike-official |
| tags | ["cis","aws","monitoring","cloudwatch","cloudtrail","metric-filters","alarms","route-table","vpc","networking"] |
| cis_id | 5.13 |
| cis_benchmark | CIS AWS Foundations Benchmark v7.0.0 |
| tech_stack | ["aws"] |
| cwe_ids | [] |
| chains_with | ["cis-aws-foundations-4.1","cis-aws-foundations-4.2"] |
| prerequisites | [] |
| severity_boost | {} |
Real-time monitoring of API calls can be achieved by directing CloudTrail Logs to CloudWatch Logs or an external Security Information and Event Management (SIEM) environment, and establishing corresponding metric filters and alarms.
Routing tables are used to route network traffic between subnets and to network gateways.
It is recommended that a metric filter and alarm be established for changes to route tables.
CloudWatch is an AWS native service that allows you to observe and monitor resources and applications. CloudTrail logs can also be sent to an external Security Information and Event Management (SIEM) environment for monitoring and alerting.
Monitoring changes to route tables will help ensure that all VPC traffic flows through the expected path and prevent any accidental or intentional modifications that may lead to uncontrolled network traffic. An alarm should be triggered every time an AWS API call is performed to create, replace, delete, or disassociate a route table.
N/A
If you are using CloudTrail trails and CloudWatch, perform the following to ensure that there is at least one active multi-region CloudTrail trail with the prescribed metric filters and alarms configured:
aws cloudtrail describe-trails
Identify multi-region CloudTrail trails: Trails with "IsMultiRegionTrail" set to true
Note the value associated with "Name":<trail-name>
Note the <trail-log-group-name> within the value associated with "CloudWatchLogsLogGroupArn"
arn:aws:logs:<region>:<account-id>:log-group:<trail-log-group-name>:*Ensure the identified multi-region CloudTrail trail is active:
aws cloudtrail get-trail-status --name <trail-name>
Ensure IsLogging is set to TRUE
Ensure the identified multi-region CloudTrail trail captures all management events:
aws cloudtrail get-event-selectors --trail-name <trail-name>
IncludeManagementEvents set to true and ReadWriteType set to All<trail-log-group-name> captured in step 1:aws logs describe-metric-filters --log-group-name <trail-log-group-name>
"filterPattern": "{($.eventSource = ec2.amazonaws.com) && ($.eventName = CreateRoute) || ($.eventName = CreateRouteTable) || ($.eventName = ReplaceRoute) || ($.eventName = ReplaceRouteTableAssociation) || ($.eventName = DeleteRouteTable) || ($.eventName = DeleteRoute) || ($.eventName = DisassociateRouteTable) }"
Note the <route-table-changes-metric> value associated with the filterPattern from step 3.
Get a list of CloudWatch alarms, and filter on the <route-table-changes-metric> captured in step 4:
aws cloudwatch describe-alarms --query 'MetricAlarms[?MetricName==<route-table-changes-metric>]'
Note the AlarmActions value; this will provide the SNS topic ARN value.
Ensure there is at least one active subscriber to the SNS topic:
aws sns list-subscriptions-by-topic --topic-arn <sns-topic-arn>
arn:aws:sns:<region>:<account-id>:<sns-topic-name>:<subscription-id>A metric filter exists with the filter pattern matching route table change events, a CloudWatch alarm is configured for the metric, and the alarm has an active SNS topic with at least one subscriber.
If you are using CloudTrail trails and CloudWatch, perform the following steps to set up the metric filter, alarm, SNS topic, and subscription:
<trail-log-group-name> taken from audit step 1:aws logs put-metric-filter --log-group-name <trail-log-group-name> --filter-pattern '{ ($.eventName = CreateRoute) || ($.eventName = CreateRouteTable) || ($.eventName = ReplaceRoute) || ($.eventName = ReplaceRouteTableAssociation) || ($.eventName = DeleteRouteTable) || ($.eventName = DeleteRoute) || ($.eventName = DisassociateRouteTable) }' --metric-transformations metricName=<route-table-changes-metric>,metricNamespace='CISBenchmark',metricValue=1
aws sns create-topic --name <sns-topic-name>
aws sns subscribe --topic-arn <sns-topic-arn> --protocol <sns-protocol> --notification-endpoint <sns-subscription-endpoints>
aws cloudwatch put-metric-alarm --alarm-name <route-table-changes-alarm> --metric-name <route-table-changes-metric> --statistic Sum --period 300 --threshold 1 --comparison-operator GreaterThanOrEqualToThreshold --evaluation-periods 1 --namespace 'CISBenchmark' --alarm-actions <sns-topic-arn>
By default, CloudTrail logs route table events (e.g., CreateRoute, DeleteRouteTable), but no CloudWatch metric filters or alarms exist. These changes are captured but not actively monitored unless configured.
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 8.5 Collect Detailed Audit Logs | x | x | |
| v8 | 8.11 Conduct Audit Log Reviews | x | x | |
| v7 | 6.2 Activate audit logging | x | x | x |
| v7 | 6.3 Enable Detailed Logging | x | x |
Level 1 | Manual